# 序列类型、字典类型和集合类型

numbers = [1,2,3,4]
print(numbers[0])
print(numbers[1])
print(numbers[2])
print(numbers[3])

numbers[3]=99
print(numbers[3])

names = ["张三","李四","王五"]
names[2] = "田七"
print(names[2])

numbers = (1,2,3,4)
print(numbers[0])
print(numbers[1])
print(numbers[2])
print(numbers[3])

# numbers[3]=99 # 会出错
zero_to_nine = range(10)
one_to_ten = range(1,11)
one_three_five = range(1,6,2)

print(zero_to_nine[0])
print(one_to_ten[9])
print(one_three_five[1])

city = {"name":"南京","population":8000000}
print(city["name"])
print(city["population"])

city['name'] = "上海"
city['population'] = 20000000
print(city["name"])
print(city["population"])


number_list = [1,2,1,2]
print(number_list)

number_set = {1,2,1,2}
print(number_set)